Carbs are my downfall....

I've been doing low carb again for 6 days now...it's hard. I lost 8 lbs. in 4 days and was soooo excited! Then I weighed today and I gained 2 lbs!!:( I did eat a few frozen strawberries, blueberries, rasberries (the ones that come in a bag) last night...maybe that totally threw it off. I don't know. Other than that, I have been good about not having any carbs. It's just disappointing. Low carb is hard enough for me and when I don't see results, it's even harder.:( I'll just keep hanging in there and hope Fridays' weigh-in goes a bit better.